Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 17, Pages 8581-8590Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402045p
Keywords
organic solar cell; morphology; P3HT:PCBM; GISAXS; GIWAXS
Funding
- Bavarian Collaborative Research Project Solar technologies go Hybrid (SolTec)
- Bavarian State Ministry of Sciences, Research and Arts
- International Graduate School
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Bulk heterojunction (BHJ) solar cells from 1,2-dichlorobenzene solution processed regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT): phenyl-C61-butyric acid methyl ester (PCBM) are prepared and investigated at different steps of the multilayer stack build-up of the device. The inner structure is probed from the molecular to the mesoscale with grazing incidence small/wide-angle Xray scattering (GISAXS/GIWAXS) and X-ray reflectivity (XRR). The surface morphology is detected with atomic force microscopy (AFM). Therefore, an in-depth knowledge of the three-dimensional morphology of the bulk heterojunction solar cell, starting from the cleaned ITO substrate up to the final post-treated solar cell, is generated. The active layer structure is influenced by the annealing as well as by the top contact deposition. Structures coarsen during the evaporation of the metal contacts. The P3HT crystal structure strongly depends on the device processing as well. These morphological changes together with the diffusion of aluminum atoms to the active layer are of importance for the device efficiency.
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